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Allowance for Doubtful Accounts
 6 Months Ended
Jun. 30, 2018
Receivables [Abstract]  
Allowance for Doubtful Accounts

6. Allowance for Doubtful Accounts

 

     Balance at
Beginning of
Period		      Charged to
Expense		      Deductions(1)      Balance at
End of
Period		  

Six months ended June 30, 2018

    $ 5,907        8,669        (8,483 )     $ 6,093  

Six months ended June 30, 2017

    $ 5,918        7,830        (8,179 )     $ 5,569  

 

(1)

Deductions represent accounts written off, net of recoveries.